Projector and image projection method

Inactive Publication Date: 2011-07-28
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0018]According to the image projection method described above, when the amount of previous trapezoidal correction is greater than a predetermined acceptable value, the amount of trapezoidal correction is set at a predetermined standard value or zero aft

Problems solved by technology

In a projector of this type, when a significant amount of trapezoidal correction has been performed before the projector is turned off and then the posture of the projector or any other parameter thereof is greatly changed before the projector is turned on next time, the number of operations for changing the amount of trapezoidal correction to an appropriate value increases when the projector is turned on next time, resulting in a possible cumbersom

Method used

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first embodiment

[0025]A projector according to a first embodiment of the invention will be described below with reference to FIGS. 1A to 1C, 2, and 3.

A. Structure of Projector

[0026]A projector 10 includes a controller 11, a storage unit 12, a key input processor 13, an input selector 14, an image processor 15, a video projection unit 17, a communication unit 18, a power source 22 in a body 10a, as shown in FIG. 1A.

[0027]The controller 11 controls the entire functionality of the projector 10. That is, the controller 11 is connected to the storage unit 12, the key input processor 13, the input selector 14, the image processor 15, the communication unit 18, the power source 22, and other components and can communicate therewith. The controller 11 acquires information from the components described above or sends control signals or other signals thereto so that the actions thereof are controlled. The controller 11 includes a correction level comparing section 11a, a correction maintaining section 11b, a...

second embodiment

[0049]A projector according to a second embodiment will be described below. The projector of the second embodiment is a variation of the projector of the first embodiment, and the portions that will not be particularly described are the same as those of the projector of the first embodiment.

[0050]The action of the projector according to the second embodiment will be described with reference to FIGS. 4 and 5. The controller 11 in the projector 10 first executes a sequence of turning on the lamp and operates the image processor 15 to instruct the video projecting unit 17 to start image projection (step S111). The controller 11, specifically the adjustment unit 11g, reads the amount of previous trapezoidal correction from the storage unit 12 (step S112) and then reads an acceptable value from the storage unit 12 (step S113). The controller 11, specifically the adjustment unit 11g, then compares the amount of previous trapezoidal correction obtained in step S112 with the acceptable valu...

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Abstract

A projector includes: an image projection unit that projects an image; a trapezoidal correction unit that performs trapezoidal correction on the image projected by the image projection unit; a nonvolatile storage unit that stores the amount of previous trapezoidal correction and a predetermined acceptable value associated with the amount of previous trapezoidal correction, the amount of previous trapezoidal correction being used immediately before at least one of when the projector is turned off and when signal processing is changed; and an adjustment unit that sets, if the amount of previous trapezoidal correction is greater than the predetermined acceptable value, the amount of trapezoidal correction to be performed by the trapezoidal correction unit at a predetermined standard value or zero after the projector is activated or after the signal processing is changed.

Description

[0001]The entire disclosure of Japanese Patent Application No. 2010-013934, filed Jan. 26, 2010 is expressly incorporated by reference herein.BACKGROUND[0002]1. Technical Field[0003]The present invention relates to a projector capable of projecting an image having undergone trapezoidal correction and an image projection method executed by the projector.[0004]2. Related Art[0005]There has been a known projector that allows reduction in distortion of an obliquely projected image. The projector forms an image in part of an image display area on an image formation panel to correct trapezoidal distortion of a displayed image. In a manual adjustment type projector, in particular, the amount of trapezoidal distortion correction, that is, the amount trapezoidal correction, is saved when the projector is turned off, and the amount of trapezoidal correction is read when the projector is next turned on so that the same trapezoidal correction as that previously performed is performed. In a proj...

Claims

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Application Information

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IPC IPC(8): G03B21/14
CPCG03B21/14H04N9/3197H04N9/3185H04N23/00
Inventor OZAWA, TAKASHI
Owner SEIKO EPSON CORP
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